Philosophy Lexicon of Arguments

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Modal logic: the modal logic is an extension of classical logic to systems in which possibility and necessity can also be expressed. Different approaches use operators to express "necessary" and "possible", which, depending on the placement within formulas, can let claims of different strengths win. E.g. there is an object which necessarily has the property F/it is necessary that there is an object with the property F. The introduction of possible worlds makes quantification possible for expressing possibility (There is at least one world in which ...) and necessity (For all worlds is valid ...). See also operators, quantifier, completion, range, possible worlds.

Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.
Author Item    More concepts for author
Bigelow, John Modal Logic   Bigelow, John
Chisholm, Roderick M. Modal Logic   Chisholm, Roderick M.
Field, Hartry Modal Logic   Field, Hartry
Geach, Peter T. Modal Logic   Geach, Peter T.
Hintikka, J. Modal Logic   Hintikka, J.
Kripke, Saul Aaron Modal Logic   Kripke, Saul Aaron
Lewis, David Modal Logic   Lewis, David
Quine, Willard Van Orman Modal Logic   Quine, Willard Van Orman
Stalnaker, R. Modal Logic   Stalnaker, R.

Ed. Martin Schulz, access date 2017-10-24